Most of the entries under Accountsettings are self-explanatory. Here are a few additional notes.

Your password is needed to change your email address.

Your password is needed to create or change the API key for your account. See CoCalc API documentation to learn about the API.

The Newsletter checkbox doesn’t do anything yet. We don’t send out a newsletter.

Sign Out of CoCalc using one of the orange “Sign Out” buttons. You will be asked to confirm your selection.

Choosing the red DeleteAccount... button will cause a warning window to pop up. Confirmation is required before proceeding.

warning displayed when “Delete Account…” is clicked

Use one or more of the options under Linkedaccounts if you want to sign in with Facebook, GitHub, Google, or Twitter. You can also unlink online accounts from CoCalc in this section. To sign in with a linked account, choose the icon for Facebook, GitHub, Google, or Twitter under the blanks for Email address & Password at upper right in the sign-in screen.

Most options under “Editor settings” are self-explanatory. Here are additional details.

Enable Jupyterclassic if you have a specific requirement for a Jupyter feature that isn’t available under CoCalc Jupyter. With this box checked, the default for opening .ipynb files in the CoCalc interface will be Classic jupyter. See warnings regarding Classical versus CoCalc notebooks before enabling this feature.

This section assumes you have created an SSH key pair as described in SSH Keys.

Click the gear icon next to your name at upper right to open Account Settings.
Choose the tab “SSH Keys” and note the form for adding a key at right.
Enter a title for the key in the Title field. Specify a title that is meaningful to you for the key pair you are using, for example John’s CoCalc Key.
Copy the public key into the Key field. To do this, open the file for your public key on your local computer. For example, if you are using macOS or Ubuntu, you could open a terminal and type something like the following, depending on the name of your public key file.
cat ~/.ssh/id_ed25519.pub
Use your mouse to highlight the contents of the key file, then copy and paste it into the Key area. saving the entry.

Click Add SSH Key. Your key is now saved for that account and will work for all projects for which that account has owner or collaborator status.
As with the previous section, the user@hostname string needed for the ssh command consists of the project id with hyphens removed for the user, and ‘ssh.cocalc.com’ for the hostname, and can be found just below the caption Use the following username@host: in the ‘SSH Keys’ section of project status tab.